Historical clue formulations

• Lacking a musical key — 2026-08-31
• Lacking a key, in music — 2026-01-05
• Like some experimental music — 2025-04-24
• Like some music that's challenging to sing — 2024-03-20
• Keyless — 2023-08-20
• Like much avant-garde music — 2021-02-03
• Having no musical key — 2020-02-26
• Discordant — 2018-12-02
• Like some avant-garde music — 2017-12-14
• Hard-to-hum, in a way — 2016-03-16
• Like many Second Viennese School works — 2016-02-20
• Lacking in harmony — 2014-05-07
• Lacking a key, musically — 2014-03-10
• Lacking a key, musically — 2014-01-13
• Like some noise music — 2013-04-21
• Like the opera "Wozzeck" — 2013-04-04
• Like much avant-garde music — 2012-06-24
• Hard-to-hum, say — 2012-05-22
• Discordant — 2012-02-26
• Not in any key — 2011-11-30
• Missing a key? — 2011-08-27
• Like much Schoenberg music — 2011-05-11
• Keyless — 2010-09-07
• Like Berg's "Wozzeck" — 2010-04-25
• Lacking a signature, say — 2010-01-30
• Keyless — 2009-12-06
• Lacking a key — 2009-04-12
• Like Arnold Schoenberg's music — 2008-10-26
• Like some music — 2007-10-30
• Like some modern music — 2007-01-01
• Lacking a key — 2006-05-04
• Hard-to-hum — 2006-02-06
• Discordant — 2005-11-08
• Lacking a key, in music — 2005-09-26
• Lacking a musical key — 2004-03-17
• Unkeyed — 2004-02-06
• Like much of Webern's work — 2003-12-20
• Jarring, musically — 2003-07-20
• In no particular key — 2001-07-31
• Like some music — 1998-10-15
• Like Schoenberg's music — 1997-07-15
• Like Alban Berg's music — 1997-05-08
• Lacking a musical quality — 1996-12-19
• Hardly melodious — 1996-11-03
• Not keyed — 1996-06-16
• Like much Schoenberg music — 1995-12-11
• Unkeyed, musically — 1995-05-14
• Like some 20th-century compositions — 1995-04-12
• Like Schoenberg's works — 1995-02-17
• Without a key — 1994-12-25